1890.] 



The Passive State of Iron and Steel. 



123 



Unknown to each other, we have been simultaneously and indepen- 

 dently prosecuting researches having a like object, and it is satisfac- 

 tory to have arrived at somewhat similar conclusions, though by 

 different methods of experimentation. 



SERIES II. 



Influence of Magnetisation on tJie Passive State of Steel in Nitric 

 Acid, 1'42 sp, gr. t above the temperature of 45 F. 



The experiments for this set of observations were conducted in a 

 somewhat similar manner to those of Series I. The JJ-tube contain- 



FIG. 2. 



ing the nitric acid of 1'42 sp. gr., with the magnetised bar A, 

 8^ inches long, 0'261 inch diameter (permanently magnetised by 

 touch), and unmagnetised bar B, 8 inches long, O261 inch diameter, 



